Quantitative analysis of the metal content of minerals, alloys, etc. In the narrow sense, it is the determination of the purity of precious metals such as monetary bullion. There are dry assays, which separate gold and silver in their metallic form, and wet assays, which extract them in the form of compounds. One assay method used since ancient times is to determine the purity of gold by rubbing a sample and comparing the color of the streaks with that of a standard sample. The stones used for this purpose were called touchstones, and black, dense basalt or chert were used. Source : Heibonsha Encyclopedia About MyPedia Information |
鉱物,合金などの金属分の定量分析。狭義には貨幣用地金などの貴金属の純度を決定すること。金,銀を金属の形で分離する乾式試金と,化合物の形で抽出する湿式試金とがある。古代から利用されていた試金法の一つに,試料をこすりつけ,その条痕の色と標準品の条痕の色とを比べて金の純度を知る方法がある。この目的で使われた石を試金石と呼び,黒色で緻密な玄武岩やチャートが用いられた。
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